Forbes has a new website where anyone can create org charts for their company or browse through the organizational charts of other publicly listed U.S. companies like Google, Microsoft, Dell, Yahoo!, etc.
The org chart software is completely web based and free but can help you create professional looking organization charts via a simple Flash based drag-n-drop interface just like Microsoft Visio or SmartDraw.
To make a connection, drag a person over his/her boss, wait for the boss to turn orange and then release. To make an unconnected employee the boss of someone already on the chart, drag the boss over the employee and wait for the flash. Once it flashes, move the boss above the employee and release.
Wait, there's something even more useful. You can search the Forbes org charts database for company names or even individual employees in a manner similar to Google Finance (search as you type). Clicking the employee name will show his current status / position in the organization.
You can navigate the org charts using a Google Maps like navigation controls. The charts can later be printed as picture diagrams or text outlines.
Forbes Org Charts - Corporate Org Chart Wiki
Related: Create Family Tree in Microsoft Word